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Hi Several things spring to mind. The most important thyroid test, especially for this is the Free T3, if GP no longer allowed to do this, use Blue Horizon, finger prick test.If FT3 out of range, high or low it can cause this sort of problem.It is n o good taking vit D without a calcium check, should be under an Endo really. before starting it ( script) you also need a test for calcium if calcium below range then you need that too to absorb the D ( NICE) if very high in range, the D will push the calcium over range, very dangerous as an electrolyte. In that case you can no longer take D, my calcium is dangerous, so now vit D 20, Osteomalacia, no alternative. You need to start D slowly with re tests on that and calcium 3 months etc until OK , then sometimes retest both.

As regards the other symptoms. Thyroid disease, treated or untreated can bring in the onset of Atrial Fibrillation ( A.F)To diagnose this take BP and heart rate, pulse, manually by hand 3 times a day, ( not with thumb)must including when "Odd", do this for 2 weeks, if H.R ( Heart rate) uneven at times very obvious. Then ask for a 24 hour or better 7 day monitor from the GP. If anything shows referral to an electrical cardio. This is very common not too serious but needs treating to avoid strokes.Sometimes it is a temporary problem due to the meds but essential to be checked out.